Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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A Study on the Sedimentation of Dredged Soils and Shape Changes of a Transparent Vinyl Tube by Filling Tests - Anti-Crater Formation -

준설토 주입방법에 의한 비닐튜브체의 퇴적 및 변형 특성 - 크레이터 방지 기술을 중심으로 -

  • Received : 2014.02.24
  • Accepted : 2014.05.14
  • Published : 2014.06.30
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Abstract

In this study, two different types of dredged fill injection methods are introduced and filling experiments were conducted to analyze the impact of each technique to the distribution and deposition of dredged soil fill and how it influence the final tube shape. Two transparent plastic tubes were fabricated to observe the deposition behavior of the deposited fill material. Both tubes measured 4.0 meters in length (L) and has vinyl tube diameters (D) of 0.5m and 0.7m. T-type and I-type inlet system are also introduced in this paper. The influence of this inlet systems to the distribution and deposition behavior of dredged soil fill inside the vinyl tubes were observed during the experiment. After the sedimentation of the slurry mixture, the water on top of the soil sediments are removed and the slurry mixture was re-injected into the vinyl tube, this process was carried out repeatedly. The shape changes of the vinyl tube, e.g. the changes in both tube height and width, are constantly monitored after each slurry injection and water draining phases. Crater formation was observed in the case of I-Type inlet system and a non-uniform sediment distribution occurred. For the diffusion deposit of soil particles to long distance are minimal shape technique using the T-Type inlet system. Therefore the undrain filling height ratio ($H/D_0$) was found to be around 0.54 to 0.64 and the horizontal strain ratio ($W/D_0$) ranges from 1.45 to 1.54. The filling soil height is proportional to dredged-material filling phases, but, horizontal strain ratio is constant or inversely reduced so that the center of tube body is raised in the upward direction.

본 연구에서는 준설토 주입 후 튜브 내부 준설토의 퇴적분포가 튜브 형상에 미치는 영향을 분석하기 위해 준설토 주입실험 결과를 바탕으로 튜브 내 준설토의 퇴적분포와 튜브 거동에 대해 소개하였다. 튜브 내 준설토의 퇴적분포를 관찰하기 위해 투명 비닐소재를 사용하여 튜브를 제작하였고, 이때 튜브의 직경(D)은 0.5m와 0.7m이고 길이(L)는 모두 4.0m이다. 주입형태에 따른 튜브 내 준설토의 퇴적분포 형태를 관찰하기 위해 준설토 주입형태는 I-Type과 T-Type을 적용하였다. 실험은 주입, 침강 및 퇴적 후에 준설토 상부의 물을 배수과정에서 제거하고 슬러리 상태의 시료를 재주입하는 과정을 반복하여 수행하였고, 주입 및 배수 단계에서 튜브 내 준설토의 퇴적분포와 튜브의 연직 및 수평 거동을 관찰하였다. 주입실험 결과 I-Type 주입의 경우 크레이터 형성에 의한 부유 및 확산퇴적이 동시에 발생되는 분리퇴적에 의해 비균질 거동을 나타내고, T-Type 주입은 확산수평퇴적으로 인하여 퇴적 튜브 내 준설토가 균등하게 분포하는 것으로 나타났으며, 비배수 초기 연직충진비($H/D_0$)는 0.54~0.64 정도이고 수평변형비($W/D_0$)는 1.45~1.54로 퇴적고는 준설토 충진에 비례하여 증가하나 수평변형비는 일정하거나 감소하면서 튜브체의 중심은 상향이동 되고 있다.

Keywords

References

  1. Chang, Y. C., Lee, S. E., Kim, S. W., Son, K. Y. (2012), "Behavior of Geotextile Tube for Erosion Control", Journal of the Korean Geotechnical Society, Vol.28, No.5, pp.5-12. https://doi.org/10.7843/kgs.2012.28.5.5
  2. Cho, S.D (1998), "Applied techniques by New Geosynthetics", '98 Geosynthetics Seminar, pp.269-295.
  3. Chu, J., Guo, W., Yan, S. W. (2011), "Geosynthetic Tubes and Geosynthetic Mats: Analyses and Applications", Journal of Geotechnical and Geoenvironmental Engineering, SEAGS and AGSSEA, Vol.42, No.1, pp.56-65.
  4. Heerten, G. (1980), "Long-Term experience with the use of synthetic filter fabrics in coastal engineering", Coastal Structures '80, ASCE, Vol.2, pp.2174-2193.
  5. Kim, H. J., Jamin, J.,Won, M. S., Sung, H. J., and Lee, J. B. (2013), "A Study on the Behaviour of Dredged Soil Stratified In a Transparent Geobag", The 2013 World Congress on Advances in Structural Engineering and Mechanics (ASEM13), jeju, Korea, pp.2980-2987.
  6. Kim, H. J., Lee, M. S., Lee, Y. J., Kim, D. W. (2003), "A Study on the Sediment Volume Change and Two-dimensional Deposited Characteristics of Pumping-dredged Soil", Journal of Korean Geotechnical Society, Vol.19, No.4, pp.155-165.
  7. Kim, H. J., Shim, M. B., Jeon, H. S., Lee, M. S., Paek, P. S., Choi, D. I. (2006), "A Study on the Property of Dredging Soils Stratified by Two dimensional Segregating Sedimentation", KGS Fall Conference 2006, pp.481-489.
  8. Kim, H. J., Sung, H. J. (2013), "A Study on the Influencing Factor for the Decision of the Embankment Construction Method using Geotextile tube Filled with Dredged soil", Korea Academia-Industrial Cooperation Society, Vol.14, No.10, pp.5230-5236. https://doi.org/10.5762/KAIS.2013.14.10.5230
  9. Koerner, R. M., Hwu, B. L., Wayne, M. L. (1987), "Soft soil stabilization designs using geosynthetics", Journal of Geotextiles and Geomembranes 6, pp.33-52. https://doi.org/10.1016/0266-1144(87)90056-2
  10. Leshchinsky, B., Leshchinsky, O., Ling, H. I., Gilbert, P. A. (1996), "Geosynthetic Tubes for Confining Pressurized Slurry : Some Design Aspects", Journal of Geotechnical Engineering, ASCE, Vol.122, No.8, pp.682-690. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:8(682)
  11. Liu, G. S., Silverster, R. (1977), "Sand Sausages for Beach Defence Work", 6th Australasian Hydraulics and Fluid Mechanics Conference, Adelaide, Australia, pp.340-343.
  12. Oh, Y. I. (2004), "The Research trends of Geotextile tubes", Korean Geosynthetics Society, Vol.3, No.2, pp.24-29.
  13. Shin, E. C., Oh, Y. I. (2002), "Behavior and Shape Variation of Geotextile Tube by Pilot Scale Field Tests", Korean Society of Civil Engineers, KSCE, Vol.22, No.6, pp.661-671.
  14. Shin, E. C., Jang, W. L., Kim, S. H., Oh, Y. I. (2008), "Dewatering of dredged sludge using geotextile tube", J. Korean Geosynthetics Socity Vol.7, No.1 March. 2008 pp.23-29.
  15. Stephenson, R. W. (1982), "A Study of soil-filled synthetic fabric "Pillows" for erosion protection", 2nd Inter. conf. on Geotextiles, Las Vegas, U.S.A.
  16. Won, M. S. and Kim, H. J. (2013), "The horse connecting module for filling tube and dredge soils injection device with the same", Korea Patent Application No. 10-2013-0078353.